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BHC Polymer Additives Co., Ltd / Shanghai Crystal Wells Chemical New Materials Co., Ltd.
Composite Masterbatch Particles
Composite Masterbatch Particles
Formulating with several single-function accelerator masterbatches means several separate weighing steps — and several separate chances for a dosing error. Composite masterbatch particles solve this by combining multiple active components into one pre-dispersed granule, cutting the vulcanization system down to a single accurate addition instead of a stack of individually weighed additives.
BHFH-80 is our in-house developed comprehensive accelerator, purpose-built as an environmentally friendly, high-efficiency replacement for single-type accelerator masterbatches in EPDM compounds — particularly EPDM sealing strip extrusion run on hot air vulcanization lines.
Technical Specifications
| BHFH-80 | |
|---|---|
| Composition | 80% complex accelerator, 20% carrier and dispersing aids |
| Appearance | Slight yellow particles |
| Density | ≈1.20 g/cm³ |
| Filtration | 140 μm |
Why Compounders Switch to BHFH-80
One accurate addition, not several
Replacing a stack of single-type accelerator masterbatches with one composite grade removes the weighing-error risk that comes with multiple separate additions to the same batch.
Clean, reliable processing
Free-flowing and non-agglomerating, with no dust and no feeding loss, BHFH-80 disperses quickly and evenly through the rubber compound and does not bloom to the surface after vulcanization.
No nitrosamine byproduct
After vulcanization, BHFH-80 does not generate nitrosamine carcinogens or irritating odors, and does not pollute the working environment — an increasingly important consideration for compliance-conscious manufacturers.
Built for hot air vulcanization
BHFH-80 is specifically engineered for the hot air vulcanization systems used in EPDM sealing strip extrusion, rather than being a general-purpose accelerator adapted after the fact.
How to Use BHFH-80
| Vulcanization System Component | Typical Ratio |
|---|---|
| EPDM | 100 phr |
| BHFH-80 | 3–5 phr |
| Sulphur | 1.0–1.8 phr |
Our technical engineers specialize in the EPDM sealing product industry and are available to guide the vulcanization system on-site if needed. BHFH-80 is used for EPDM industrial products including car seals, hoses, conveyor belts, transmission belts, and cable jackets. It's supplied in 25 kg boxes and should be stored in cool, dry conditions, with a shelf life of one year.
Frequently Asked Questions
1. What's actually inside a composite masterbatch like BHFH-80?
BHFH-80 is a complex accelerator system — multiple accelerator components pre-blended together at 80% active content in a single carrier — rather than a single accelerator chemistry. This is what lets it replace several separate single-type masterbatches with one addition.
2. Is BHFH-80 only for EPDM sealing strips?
It's purpose-built for EPDM hot air vulcanization systems, with sealing strip extrusion as the primary use case, but it's also used across other EPDM industrial products such as hoses, conveyor belts, transmission belts, and cable jackets.
3. Why does the nitrosamine issue matter for accelerator selection?
Some conventional accelerator systems can generate nitrosamine byproducts during vulcanization, which has drawn increasing regulatory and workplace safety scrutiny. BHFH-80 is formulated specifically to avoid this byproduct, which simplifies compliance for manufacturers selling into markets with nitrosamine restrictions.
4. Do I need to adjust my existing EPDM vulcanization system to use BHFH-80?
The listed ratio (100 phr EPDM : 3–5 phr BHFH-80 : 1.0–1.8 phr sulphur) is a starting point rather than a fixed formula. Since BHFH-80 replaces a combination of accelerators rather than a single one, our technical engineers can guide you through adapting your specific vulcanization system on-site.
Comparison of roll kneading performance with powder products
Comparison of roll kneading performance with powder products |
| 10 seconds later | 30 seconds later | 60 seconds later | |
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| POWDER |  |
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